Ann,
The reason that FTM didn't see your tree as linked when you opened it from another Windows account is because the sync files are stored in users\...\appdata\roaming\familytreemaker. Had you copied them over to the other profile, FTM would have seen the tree as linked.
The reason that FTM didn't see your tree as linked when you opened it from another Windows account is because the sync files are stored in users\...\appdata\roaming\familytreemaker. Had you copied them over to the other profile, FTM would have seen the tree as linked.